package com.it.educenter.controller;

import com.google.gson.Gson;
import com.it.educenter.utils.ConstantWxUtils;
import com.it.commonutils.HttpClientUtils;
import com.it.commonutils.JwtUtils;
import com.it.educenter.entity.UcenterMember;
import com.it.educenter.service.UcenterMemberService;
import com.it.servicebase.exceptionhandler.GuliException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLDecoder;
import java.util.HashMap;

//@RestController 返回数据 需要要这个注解
@Controller //不返回数据 返回这个注解
@RequestMapping("/api/ucenter/wx")
@CrossOrigin
public class WxApiController {
    @Autowired
    private UcenterMemberService ucenterMemberService;
    //获取扫描人信息 添加数据
    @GetMapping("callback")
    public String callback(String code,String state) throws Exception {

        try{
            //1 获取code值
            //2通过code 得到access_token open_id  向认证服务器发送请求换取access_token
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            //得到一个拼接好的地址
            String accessTokenUrl = String.format(baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code);

            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //解析json字符串
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String)mapAccessToken.get("access_token");
            String openid = (String)mapAccessToken.get("openid");


            //扫码人信息 加到数据库
            UcenterMember member=ucenterMemberService.getOpenIdMember(openid);
            if(member==null){

                //3 访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";

                //3.1 拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid);

                //3.2 发送请求得到结果
                String userInfo = HttpClientUtils.get(userInfoUrl);
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname =(String) userInfoMap.get("nickname");
                String headimgurl = (String)userInfoMap.get("nickname");


                member=new UcenterMember();
                member.setOpenid(openid);
                member.setAvatar(headimgurl);
                member.setNickname(nickname);
                ucenterMemberService.save(member);
            }

            //使用jwt根据member生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            //通过路径传递字符串
            return "redirect:http://localhost:3000?token="+jwtToken;

        }catch (Exception e){
            throw new GuliException(20001,"登陆失败");
        }
    }

    //生成二维码
    @GetMapping("login")
    public String getWxCode(){
        /*String Url="https://open.weixin.qq.com/connect/qrconnect?" +
                "appid="+ ConstantWxUtils.WX_OPEN_APP_ID+ "&response_type=code";*/

        // 微信开放平台授权baseUrl
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLDecoder编码
        String redirectUrl=ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try{
           redirectUrl = URLDecoder.decode(redirectUrl, "utf-8");
        }catch(Exception e){

        }

        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "it"
                );
        //重定向到请求微信地址
        return "redirect:"+url;
    }
}



